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Finding the Fourth Proportional to 261,785.40, 392,562.90 and 103,961.40

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Solution

The fourth proportional to 261,785.40, 392,562.90 and 103,961.40 is: 155,896.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,785.40 : 392,562.90 = 103,961.40 : x
  2. Step 2: Convert to fraction form
    261,785.40/392,562.90 = 103,961.40/x
  3. Step 3: Cross multiply
    261,785.40x = 392,562.90 × 103,961.40
  4. Step 4: Simplify right side
    261,785.40x = 40,811,388,672.06
  5. Step 5: Solve for x
    x = 40,811,388,672.06/261,785.40
  6. Step 6: Final answer
    x = 155,896.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.